Update golang dependencies

vendor/k8s.io/kubernetes/pkg/cloudprovider/providers/gce/metrics.go

@@ -0,0 +1,80 @@
+/*
+Copyright 2014 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package gce
+
+import (
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+type apiCallMetrics struct {
+	latency *prometheus.HistogramVec
+	errors  *prometheus.CounterVec
+}
+
+var (
+	apiMetrics = registerAPIMetrics(
+		"request", // API function that is begin invoked.
+		"region",  // region (optional).
+		"zone",    // zone (optional).
+	)
+)
+
+type metricContext struct {
+	start      time.Time
+	attributes []string
+}
+
+// Value for an unused label in the metric dimension.
+const unusedMetricLabel = "<n/a>"
+
+// Observe the result of a API call.
+func (mc *metricContext) Observe(err error) error {
+	apiMetrics.latency.WithLabelValues(mc.attributes...).Observe(
+		time.Since(mc.start).Seconds())
+	if err != nil {
+		apiMetrics.errors.WithLabelValues(mc.attributes...).Inc()
+	}
+
+	return err
+}
+
+// registerApiMetrics adds metrics definitions for a category of API calls.
+func registerAPIMetrics(attributes ...string) *apiCallMetrics {
+	metrics := &apiCallMetrics{
+		latency: prometheus.NewHistogramVec(
+			prometheus.HistogramOpts{
+				Name: "cloudprovider_gce_api_request_duration_seconds",
+				Help: "Latency of a GCE API call",
+			},
+			attributes,
+		),
+		errors: prometheus.NewCounterVec(
+			prometheus.CounterOpts{
+				Name: "cloudprovider_gce_api_request_errors",
+				Help: "Number of errors for an API call",
+			},
+			attributes,
+		),
+	}
+
+	prometheus.MustRegister(metrics.latency)
+	prometheus.MustRegister(metrics.errors)
+
+	return metrics
+}